A&D's regional models are designed for specific regions. The first two regional models are the UA-621 upper arm monitor and the UB-510 wrist monitor. A&D's regional models are designed for specific regions. The first two regional models are the UA-621 upper arm monitor and the UB-510 wrist monitor. Features Both models have the following features. Irregular HeartBeat Indicator Blood Pressure Classification Indicator Fully Automatic Measurement Large 30-Reading Memory and Average Reading Standard AC Adapter Inlet (UA-621 only) Comfortable SlimFit Cuff (UA-621 only)